Knowledge Management System Of Institute of process engineering,CAS
| Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop | |
| Alternative Title | Chem. Eng. Sci. |
| Li, HZ; Tong, H | |
| 2004-04-01 | |
| Source Publication | CHEMICAL ENGINEERING SCIENCE
 |
| ISSN | 0009-2509 |
| Volume | 59Issue:8-9Pages:1897-1904 |
| Abstract | The multi-scale methodology has been used as a conceptual tool in devising an apparatus for continuous processing of ultra-fine particles in the fluidized state. The apparatus combines a fast-bed riser with a conical dipleg into a circulating fluidized bed (CFB) loop. The micro-scale discrete ultra-fine particles gather together into meso-scale agglomerates on account of inter-particle forces, in both the fast-bed riser and the conical dipleg. In particular, in the latter, the fine particles are sufficiently entrapped because of reduced gas velocity in the top region, into the top-to-bottom and center-to-periphery mixing currents of the solids, to form agglomerates before being recycled to the bottom of the fast-bed riser. The fast-bed riser, because of its high and relatively uniform gas velocity, serves to adjust the size, especially the size distribution of the agglomerates, that is, further capture of discrete micro-scale discrete particles for the smaller agglomerates to make them larger, and attrition of over-size agglomerates to make them smaller. Uniform agglomerates of a given average size ensures stable fluidization, minimizing the danger of deposition of macro-scale lumps of agglomerates to lead to blockage as well as defluidization elsewhere in the loop. The above concept is shown experimentally operable using 4 kinds of ultra-fine particles: calcium carbonate. titanium dioxide, silicon dioxide and saponite. (C) 2004 Elsevier Ltd. All rights reserved.; The multi-scale methodology has been used as a conceptual tool in devising an apparatus for continuous processing of ultra-fine particles in the fluidized state. The apparatus combines a fast-bed riser with a conical dipleg into a circulating fluidized bed (CFB) loop. The micro-scale discrete ultra-fine particles gather together into meso-scale agglomerates on account of inter-particle forces, in both the fast-bed riser and the conical dipleg. In particular, in the latter, the fine particles are sufficiently entrapped because of reduced gas velocity in the top region, into the top-to-bottom and center-to-periphery mixing currents of the solids, to form agglomerates before being recycled to the bottom of the fast-bed riser. The fast-bed riser, because of its high and relatively uniform gas velocity, serves to adjust the size, especially the size distribution of the agglomerates, that is, further capture of discrete micro-scale discrete particles for the smaller agglomerates to make them larger, and attrition of over-size agglomerates to make them smaller. Uniform agglomerates of a given average size ensures stable fluidization, minimizing the danger of deposition of macro-scale lumps of agglomerates to lead to blockage as well as defluidization elsewhere in the loop. The above concept is shown experimentally operable using 4 kinds of ultra-fine particles: calcium carbonate. titanium dioxide, silicon dioxide and saponite. (C) 2004 Elsevier Ltd. All rights reserved. |
| Keyword | Fluidization Ultrafine Powders Agglomerate Multi-scale Structure Powder Technology |
| Subtype | Article |
| WOS Headings | Science & Technology ; Technology |
| URL | 查看原文 |
| Indexed By | SCI |
| Language | 英语 |
| WOS Keyword | FORCES |
| WOS Research Area | Engineering |
| WOS Subject | Engineering, Chemical |
| WOS ID | WOS:000221628600025 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Version | 出版稿 |
| Identifier | http://ir.ipe.ac.cn/handle/122111/4966 |
| Collection | 研究所（批量导入） |
| Affiliation | Chinese Acad Sci, Inst Proc Engn, Multiphase React Lab, Beijing 100080, Peoples R China |
| Recommended Citation GB/T 7714 | Li, HZ,Tong, H. Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop[J]. CHEMICAL ENGINEERING SCIENCE,2004,59(8-9):1897-1904. |
| APA | Li, HZ,&Tong, H.(2004).Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop.CHEMICAL ENGINEERING SCIENCE,59(8-9),1897-1904. |
| MLA | Li, HZ,et al."Multi-scale fluidization of ultrafine powders in a fast-bed-riser/conical-dipleg CFB loop".CHEMICAL ENGINEERING SCIENCE 59.8-9(2004):1897-1904. |
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| File Name/Size | DocType | Version | Access | License | ||
| Multi-scale fluidiza（413KB） | 限制开放 | CC BY-NC-SA | Application Full Text | |||
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